<?php
namespace app\common\tool;
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 * 分页类
 * 使用方式:
 * $page = new Page();
 * $page->init(1000, 20);
 * $page->setNotActiveTemplate('<span> {a} </span>');
 * $page->setActiveTemplate('{a}');
 * echo $page->show();
 *
 *
 * @author 风居住的地方
 */
class Page {
    /**
     * 总条数
     */
    private $total;
    /**
     * 每页大小
     */
    private $pageSize;
    /**
     * 总页数
     */
    private $pageNum;
    /**
     * 当前页
     */
    private $page;
    /**
     * 地址
     */
    private $uri;
    /**
     * 分页变量
     */
    private $pageParam;
    /**
     * LIMIT XX,XX
     */
    private $limit;
    /**
     * 数字分页显示
     */
    private $listnum = 8;
    /**
     * 分页显示模板
     * 可用变量参数
     * {total}   总数据条数
     * {pagesize}  每页显示条数
     * {start}   本页开始条数
     * {end}    本页结束条数
     * {pagenum}  共有多少页
     * {frist}   首页
     * {pre}    上一页
     * {next}    下一页
     * {last}    尾页
     * {list}    数字分页
     * {goto}    跳转按钮
     */
    private $template = '<div><span>共有{total}条数据</span><span>每页显示{pagesize}条数据</span>,<span>本页{start}-{end}条数据</span><span>共有{pagenum}页</span><ul>{frist}{pre}{list}{next}{last}{goto}</ul></div>';

    /**
     * 当前选中的分页链接模板
     */
    private $activeTemplate = '<li class="active"><a href="javascript:;">{text}</a></li>';
    /**
     * 未选中的分页链接模板
     */
    private $notActiveTemplate = '<li><a href="{url}">{text}</a></li>';
    /**
     * 显示文本设置
     */
    private $config = array('frist' => 'first', 'pre' => 'Previous', 'next' => 'Next', 'last' => 'last');
    /**
     * 初始化
     * @param type $total    总条数
     * @param type $pageSize  每页大小
     * @param type $param    url附加参数
     * @param type $pageParam  分页变量
     */
    public function init($total, $pageSize, $param = '', $pageParam = 'page') {
        $this->total = intval($total);
        $this->pageSize = intval($pageSize);
        $this->pageParam = $pageParam;
        $this->uri = $this->geturi($param);
        $this->pageNum = ceil($this->total / $this->pageSize);
        $this->page = $this->setPage();
        $this->limit = $this->setlimit();
    }

    /**
     * 设置分页模板
     * @param type $template  模板配置
     */
    public function setTemplate($template) {
        $this->template = $template;
    }

    /**
     * 设置选中分页模板
     * @param type $activeTemplate   模板配置
     */
    public function setActiveTemplate($activeTemplate) {
        $this->activeTemplate = $activeTemplate;
    }

    /**
     * 设置未选中分页模板
     * @param type $notActiveTemplate  模板配置
     */
    public function setNotActiveTemplate($notActiveTemplate) {
        $this->notActiveTemplate = $notActiveTemplate;
    }

    /**
     * 返回分页
     * @return type
     */
    public function show() {
        return str_ireplace(array(
            '{total}',
            '{pagesize}',
            '{start}',
            '{end}',
            '{pagenum}',
            '{frist}',
            '{pre}',
            '{next}',
            '{last}',
            '{list}',
            '{goto}',
        ), array(
            $this->total,
            $this->setPageSize(),
            $this->star(),
            $this->end(),
            $this->pageNum,
            $this->frist(),
            $this->prev(),
            $this->next(),
            $this->last(),
            $this->pagelist(),
            $this->gopage(),
        ), $this->template);
    }

    /**
     * 获取limit起始数
     * @return type
     */
    public function getOffset() {
        return ($this->page - 1) * $this->pageSize;
    }

    /**
     * 设置LIMIT
     * @return type
     */
    private function setlimit() {
        return "limit " . ($this->page - 1) * $this->pageSize . ",{$this->pageSize}";
    }

    /**
     * 获取limit
     * @param type $args
     * @return type
     */
    public function __get($args) {
        if ($args == "limit") {
            return $this->limit;
        } else {
            return null;
        }
    }

    /**
     * 初始化当前页
     * @return int
     */
    private function setPage() {
        if (!empty($_GET[$this->pageParam])) {
            if ($_GET[$this->pageParam] > 0) {
                if ($_GET[$this->pageParam] > $this->pageNum)
                    return $this->pageNum;
                else
                    return $_GET[$this->pageParam];
            }
        }
        return 1;
    }

    /**
     * 初始化url
     * @param type $param
     * @return string
     */
    private function geturi($param) {
        $url = $_SERVER['REQUEST_URI'] . (strpos($_SERVER['REQUEST_URI'], "?") ? "" : "?") . $param;
        $parse = parse_url($url);
        if (isset($parse["query"])) {
            parse_str($parse["query"], $params);
            unset($params["page"]);
            $url = $parse["path"] . "?" . http_build_query($params);
            return $url;
        } else {
            return $url;
        }
    }

    /**
     * 本页开始条数
     * @return int
     */
    private function star() {
        if ($this->total == 0) {
            return 0;
        } else {
            return ($this->page - 1) * $this->pageSize + 1;
        }
    }

    /**
     * 本页结束条数
     * @return type
     */
    private function end() {
        return min($this->page * $this->pageSize, $this->total);
    }

    /**
     * 设置当前页大小
     * @return type
     */
    private function setPageSize() {
        return $this->end() - $this->star() + 1;
    }

    /**
     * 首页
     * @return type
     */
    private function frist() {
        $html = '';
        if ($this->page == 1) {
            $html .= $this->replace("{$this->uri}&page=1", $this->config['frist'], true);
        } else {
            $html .= $this->replace("{$this->uri}&page=1", $this->config['frist'], false);
        }
        return $html;
    }

    /**
     * 上一页
     * @return type
     */
    private function prev() {
        $html = '';
        if ($this->page > 1) {
            $html .= $this->replace($this->uri.'&page='.($this->page - 1), $this->config['pre'], false);
        } else {
            $html .= $this->replace($this->uri.'&page='.($this->page - 1), $this->config['pre'], true);
        }
        return $html;
    }

    /**
     * 分页数字列表
     * @return type
     */
    private function pagelist() {
        $linkpage = "";
        $lastlist = floor($this->listnum / 2);
        for ($i = $lastlist; $i >= 1; $i--) {
            $page = $this->page - $i;
            if ($page >= 1) {
                $linkpage .= $this->replace("{$this->uri}&page={$page}", $page, false);
            } else {
                continue;
            }
        }
        $linkpage .= $this->replace("{$this->uri}&page={$this->page}", $this->page, true);
        for ($i = 1; $i <= $lastlist; $i++) {
            $page = $this->page + $i;
            if ($page <= $this->pageNum) {
                $linkpage .= $this->replace("{$this->uri}&page={$page}", $page, false);
            } else {
                break;
            }
        }
        return $linkpage;
    }

    /**
     * 下一页
     * @return type
     */
    private function next() {
        $html = '';
        if ($this->page < $this->pageNum) {
            $html .= $this->replace($this->uri.'&page='.($this->page + 1), $this->config['next'], false);
        } else {
            $html .= $this->replace($this->uri.'&page='.($this->page + 1), $this->config['next'], true);
        }
        return $html;
    }

    /**
     * 最后一页
     * @return type
     */
    private function last() {
        $html = '';
        if ($this->page == $this->pageNum) {
            $html .= $this->replace($this->uri.'&page='.($this->pageNum), $this->config['last'], true);
        } else {
            $html .= $this->replace($this->uri.'&page='.($this->pageNum), $this->config['last'], false);
        }
        return $html;
    }

    /**
     * 跳转按钮
     * @return string
     */
    private function gopage() {
        $html = '';
        $html.=' <input type="text" value="' . $this->page . '" onkeydown="javascript:if(event.keyCode==13){var page=(this.value>' . $this->pageNum . ')?' . $this->pageNum . ':this.value;location=\'' . $this->uri . '&page=\'+page+\'\'}" style="width:25px;"/><input type="button" onclick="javascript:var page=(this.previousSibling.value>' . $this->pageNum . ')?' . $this->pageNum . ':this.previousSibling.value;location=\'' . $this->uri . '&page=\'+page+\'\'" value="GO"/>';
        return $html;
    }

    /**
     * 模板替换
     * @param type $replace   替换内容
     * @param type $result   条件
     * @return type
     */
    private function replace($url, $text, $result = true) {
        $template = ($result ? $this->activeTemplate : $this->notActiveTemplate);

        $html = str_replace('{url}', $url, $template);
        $html = str_replace('{text}', $text, $html);
        return $html;
    }
}